Educational device



y 1933- J. Y. TAYLOR ET AL 2,116,153

EDUCATIONAL DEVICE Filed July so 1954 5 Sheets-Sheet 1 J. Y. TAYLOR ET AL EDUCATIONAL DEVICE Filed July .30, 1954 5 Sheets-Sheet 2 ame/ X Ey/a Car/ C. Evy/or May 3, 1938. J. Y. TAYLOR ET AL 2,116,163 v EDUCATIONAL DEVICE Filed July 30, 1934 5 Sheets-Sheet 3 May 3; 1938. J. Y. TAYLOR ET AL 2,116,163

EDUCATIONAL DE! I CE Filed July 30, 1934 5 Sheets-Sheet 4 May 3, 1938. J. Y. TAYLOR ET AL 2,115,163

EDUCATIONAL DEVICE Filed July 50, 1934 5 Sheets-Sheet 5 gwucrrvbow me/ X 752/ Car/ 6. 7EY;//a/" Patented May 3, 1938 UNITED STATES 2,116,163 EDUCATIONAL DEVICE James Y. Taylor and Carl C. Taylor, Brownwood,

Tex., asslgnors to Educational Laboratories, Inc., Brownwood, Tex., a corporatlon of Texas Application July 30, 1934, Serial No. 737,630

3 Claims.

This invention relates to new and useful improvements in educational devices.

One object of the invention is to provide an improved device for educational purposes, especially for the teaching of reading and directing eye movements, and involving certain improvements upon our Letters Patent No. 1,918,298 dated July 18, 1933.

An important object of the invention is to providean exhibiting machine having an elongated window in its front wall and having a traveling strip or roll with indicia printed thereon mounted on rollers within the machine so that the entire strip may be displayed, line by line, through the window, said front wall being hinged to swing outwardly to make for easy accessibility to the interior, the swinging wall associated with mechanism for automatically stopping the forward travel and reversing the travel of the strip when the door is opened.

Another object of the invention is to provide an exhibiting machine having an elongated window through which a line of indicia is displayed, said window being closed by a plurality of panels which are operated successively to exhibit sequent portions of the line, thereby forcing the observers eyes to follow the display, and means for holding any one of the panels in a closed 'or open position while the remaining panels are operating.

, A further object of the invention is to provide an improved exhibiting machine having an elongated window in its front wall and having a strip or roll with indicia or symbols printed thereon, said roll being so mounted that the entire strip may be displayed through the window, line by line, and means for automatically stopping the travel of the strip, said means being arranged so as to operate only when one of the lines of indicia is visible through the window and will not operate when the strip is traveling to move the next line into view.

Another object of the invention is to provide an improved educational device for displaying a strip or roll of indicia, line by line, said device being mounted on a movable stand in which the rolls of indicia may be stored when not in use, said stand also making for easy handling of the device in a class room, or other place.

A construction designed to carry out the invention will be hereinafter described, together with other features of the invention.

The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawings, in

which an example of the invention is shown, and wherein: s

Figure 1 is a front elevation of an educational tdievice constructed in accordance with the inven- Figure 2 is a side elevation, showing the supporting stand in section,

Figure 3 is a detail of roll supporting frame,

Figure 4 is a transverse, vertical sectional view of the device, taken on the line 4-4 of Figure 1. 10

I Figure 5 is a transverse, vertical sectional view of the same, taken on the line 5-5 of Figure 1.

Figure 6 is a front view, partly in elevation and partly in section,

Figure 7 is a partial, longitudinal, sectional 1 view, taken on line l--l of Figure 4 and showing one end of the device,

Figure 8 is a partial longitudinal sectional view, taken on line 8-8 of Figure 4 and showing the display panel mechanism, 20

Figure 9 is a transverse, vertical sectional view taken on the line 99 of Figure 8,

Figure 10 is a perspective view of the spacer roller drive,

Figure 11 is a sectional detail of the same,

Figure 12 is a sectional detail of the drive mechamsm, i

Figure 13 is a detail of the cut-off switch,

Figure 14 is a perspective of the same,

Figure 15 is a reduced transverse sectional view 30 taken on line 15-15 of Figure 6, showing the roller shaft control bar, a

Figure 16 is a perspective detail showing the connection between the hinged front wall of the device and the mechanism shown in Figure 15,

Figure 17 is a detail of the take up roller showing its connection with the strip,

Figure 18 is a fragmentary enlarged view of the clutch details shown in Figure 6,

Figure 19 is a fragmentary partial sectional view of the structure shown in Figure 16,

Figure 20 is a sectional view taken on line 20-48 of Figure 19 looking in the direction indicated by the arrows; and

Figure 21 is an enlarged sectional view of the speed control means shown in Figure 7.

In the drawings, the numeral I 0 designates an upright casing having a bottom M. The front wall l2 of the casing has rearwardly extending flanges it at its lower end and these flanges are pivotally mounted on a longitudinal shaft 14 whereby the front wall may be swung. Springs 13' having one end secured to the flanges and the other end secured to the end walls normally hold the front wall in a closed position. The

shaft i4 extends the entire length of the casing and has its ends supported in the end walls of the casing. The. casing has end sections i5 secured thereto and these sections are preferable removable as will be hereinafter described.

The casing is supported on, and secured to transverse bars i6 which are fastened on the upper end of a stand I'- The stand is shown constructed of vertical side rods I9 which are connected at their upper ends by a longitudinal horizontal rod i9 preferably made integral with the side rods. The lower ends of the rods l9 are connected by ahorizontal rod 29, and short transverse rods 2l extend forwardly and rearwardly of the rod 20. Each rod 2i carries a pair of rollers,

22 whereby the stand is readily movable.

A pair of transverse bars 25 are secured to the upper side of the lower connecting r0d'20 and these bars support a tray 24 which is fastened thereto. The rolls 25 on which indicia are printed and which are used in the device, as will be hereinafter explained, have their lower ends resting on the tray 24. The upper ends of the rolls are held in position in the tray by a rectangular frame 26 which is substantially the same size as the tray. The frame is supported by arms 21 which are pivoted to the. vertical rods I9 of the stand i1, and it is obvious by observing Figure 3, the frame 26 may be swung outwardly as shown in dotted lines.

To limit the outward swing of the frame, a short arm 28 is pivoted to each vertical rod l8 adjacent each arm 21. Each arm 26 has a slot 29 near its outer end and a pin 30 on each arm is engaged in the slot. It is obvious that with this arrangement, the swing of the frame 26 is limited. Rearward swinging of said frame is prevented by a stop 3i secured to the vertical rods l8 of the frame. The rolls are set vertically in the tray and are held therein by the frame 26.

- When it is desired to remove a roll it is only necessary to swing the frame outwardly and any of the rolls are readily accessible. By providing space in the stand for-the rolls it is clear that all the rolls are always at hand, thereby making for convenience.

A horizontal, elongated sight opening or window is provided in the swinging front wall of the casing near its top. Within the casing a removable supply roller 36 is mounted. One end of the supply roller is engaged by the square end of a stub shaft 31 while the other end is supported by a spring tensioned sliding stud 38. The shaft and stud are journaled in opposite end walls of the casing Ill. The roller 36 carries a strip of cloth, paper, or other suitable material 39 on which is printed a series of sentences, mathematical symbols, or other educational indicia.

The strip 99 is passed upwardly and forwardly of an idler 40 which is journaled in the end walls of the casing, and then over a spacer roller M which is mounted on a shaft 42 also journaled in the end walls above the window 35. A central friction roller 43 is carried by an arm 44 which is secured to a longitudinal horizontal shaft 45 which is journaled in the end walls at the upper rear end of the casing. The friction roller rides on the spacer roller H to hold the strip tightly against the same.

After passing over the spacer roller the strip is demountably fastened to a winding roller 46 which is secured on a shaft 41 journaled in the end walls. The fastening means is shown in detail in Fig. 1'7. The strip has an eye 48' in its end and this eye is engaged by a hook 48 on the winding roller 46. The hook is so positioned that when the roller rotates in a clockwise direction, the engagement of the hook in the eye 49' winds the strip around said roller. When the roller turns in a counter-clockwise direction, as will be hereinafter explained, the hook automatically disengages from the eye.

It will be seen that the idler 49 and the spacer roller 4| hold a portion of the strip 39 in close proximity to the sight opening or window 35 and that portion is clearly visible therethrough. (Figs. 1, 4 and 6). or sentences, printed on the strip or chart i6 are so spaced lengthwise of the strip that each line may be successively and individually displayed through the window responsive to a step-by-step actuation of the spacer roller. The takeup roller shaft 41 is provided with a knob 41' at its outer end, whereby the strip may be properly adjusted when first-placed on the rollers.

For exhibiting the indicia of each line in sequence, and thereby forcing the observer's eyes to travel from left to right, a trio of doors or panels 50 are provided. Each panel is slightly wider than the window and is of such a length as to cover substantially one-third of the length of said window. The panels are arranged to slide vertically and when all of the panels are in a raised position, it is obvious that the entire window is closed and the indicia on the strip within the casing are not visible to the observer. The operating mechanism of each panel is the same and a description of'one will suffice for all.

Each panel has a depending bracket 5i (Figs. 4 and 8) secured to its lower rear end, and a link 52 has its upper end pivotally secured to said bracket. The lower end of the link has a pivotal connection with the upper end of an elongated actuating bar 53, which has its other end pivoted on a pin 54 which extends inwardly from the swinging front wall l2 of the casing. It is obvious that when the bar 53 is swung downwardly, the panel is lowered through the medium of the link 52 and bracket 5|. The bracketv has a pair of inwardly extending ears 55 at its upper end and a similar ear 56 at its lower end. These ears engage around vertical guide rods 51 which are mounted in a frame 58 rigidly-secured to the inner side of the front wall I2.

of the'ears with the guide rods maintains vertical alinement of the sliding panel.

For swinging the actuating bar 53, a bell crank lever 59 is pivotally mounted on the pin 54 adjacent the bar. The upper arm 60 of the lever is normally parallel to and extends alongside the bar and this arm has a lug 6i at its lower outer end which engages the underside of said bar. The other arm 62 of the bell crank has a roller 63 which is held in constant engagement with the edge of a peripheral flange 64 on a cam 65 by a coiled spring 66. The cam is secured on the rotatable shaft l4 which is journaled in the end walls and on which the swinging front wall l2 of the casing is pivoted. The arm 62 of the bell crank is connected to the actuating bar 53 by a coiled spring 6! which has one end fastened to the lower end of said bar and the other end The indicia, such as words When the arm 53 is swung to lower the panel, the engagement secured to an car on the outer end of the arm.

The flange 64 of the cam extends only one third around the periphery of said cam. In Figtill the Operation of the panels it is obvious that when the panel is raised the roller 83 on the bell crank arm 62 isnot engaging the flange 64 but is engaging the edge of the cam itself. As the cam rotates to the point where the flange strikes the roller, the arm 82 of the bell crank is swung away from said cam to the position shown on the lowered panel in Figure 8. The outward swinging of the arm 82 swings the arm 80 downwardly and at the same time the spring 61 which connects the bell crank to the actuating arm 53 pulls said arm downwardly, whereby the panel is lowcred. The panel remains in this position until the roller 63 rides off the flange of the cam, at which time the parts return to the position of the left hand panel in Figure 8. Since there are three panels, it is pointed out that three earns 85 are required. The flanges of the cams are so positioned that when the panel on the left Figure l is open or in alowered position, the other two panels are closed, or raised, because the rollers 63 of the bell cranks 59 controlling these latter two panels are riding the edge of the cam and are not engaging the flanges. The cams positively control the vertical travel of the panels. When the left panel is raised to close its portion of the window, due to the roller 63 of its bell crank riding off the flange 64, the middle panel is lowered because at this time the roller till of its bell crank rides onto the flange B4 and is swung. The panel on the right remains in a raised, or closed position because its roller is still riding the edge of the cam. When the middle panel closes due to the swinging of its bell crank, the third. cam comes into action lowering the panel on the right. When this panel raises, the operation is repeated. Thus, it is seen that the line of indicia visible through the window 35 is m displayed a portion at a time from left to right and the eyes of the observer are forced to travel from left to right and must make definite lateral fixations.

At times, it might be desired to operate only two of the panels keeping the third in either a raised or lowered position. For this purpose, a swinging latch bar 68 has its lower end pivoted to each frame 58 at one side thereof (Figure 8). The bar is of such height that when swung inwardly with the panel in a raised position, the upper edge of said bar will engage beneath the ears ht of the bracket and will prevent downward movement of said panel. This will also prevent swinging of the bar 53, but due to the coiled spring tl connecting the bar with the bell crank 59, the operation of the crank and cam 65 will not be interfered with. When the latch prevents movement of the panel and actuating arm,

the bell crank will swing in the usual way and the spring t'i will expand to compensate for the movement. When it is desired to lock the panel in a lowered position, said panel is lowered and the latch is swung inwardly so that a shoulder W on said latch will engage the upper edge of the ear bit on the bracket M. This will prevent upward movement of said panel. When the panel is lowered, the actuating bar 53 is swung downwardly. The downward swinging of the arm will swing the bell crank 59 due to the engagement of the underside of said bar with the lug (ii on the arm 50 of the crank. Thus, the arm 62 of the bell crank will be swung and held out of the path of the flange 64 of the cam 65. It is obvious that any or all of the panels may at any time and without interfering with the mechanism be held against operation in either an open or closed position.

When each panel has been operated once and one lineoi indicia on the strip has been displayed,; it is necessary to bring the next line of indicia into alinement opposite the window 35, whereby upon the next operation of the panels, this line will be visble to the observer. The lines of indicia on the strip tare spaced so that one quarter revolution of the spacer roller 4| will bring the next line opposite the window.

For actuating the spacer roller one quarter of a turn after the successive operation of the three panels 50, one end of the shaft 42 of said roller is extended through the end wall of the casing (Figs. 6 and 10) The end of this shaft has a pulley l5 secured thereto and a star wheel 16 is made integral with the outer face of the pulley. The star wheel is provided with elongated horizontal pins H which are positioned radially oi. said wheel. The outer edge of the star wheel rides on the outer periphery of a cam disk 18, which is mounted on a stub shaft 19 secured to and extending outwardly from the end wall of the casing beneath the shaft 42. An operating member 80 is secured to the'outer face of the cam disk and the outer end of this member extends beyond the edge of the cam disk. A slot 8| is provided in this outer end and is alined to engage the horizontal pins 11 of the star wheel when the cam disk is rotated. (Figs. 5 and 10). As the cam disk rotates, the slot 8! will engage one of the pins and thereby carry the star wheel around one quarter of a turn. The star wheel is prevented from rotating more than one quarter of a revolution at a time by the friction of the star wheel against the periphery of the cam disk. It is obvious that the disk 18 must make one complete revolution each time the star wheel rotates one quarter of a turn.

For driving the cam disk 18, a gear 82 is loosely mounted on the stub shaft 19 and this gear has a clutch 83 made integral therewith, (Fig. 11) whereby the clutch and gear may be slid on the shaft. A forked bar 84 is pivoted on a threaded pin 85 and has one end forked to engage the clutch 83. The pin 85 is threaded in a boss 86 which extends outwardly from the end wall of the casing and the pin has a collar 81 secured thereon for preventing displacement of the bar 84 from said pin (Figs. 5, 7, and 11). By screwing and unscrewing the pin within the boss the bar is swung to slide the clutch 83 and gear 82 on the stub shaft 19.

The cam disk has a lug 8B whichis engaged by the clutch 83 when said clutch is in an outward position. When the bar 84 is swung said clutch is slid inwardly, and the clutch is disengaged from the lug, whereby no motion is transmitted to the cam disk. See Fig. 11.

For driving the gear 82, an endless chain 89 is passed over said gear and downwardly around a gear 9|] which is secured to one end of the cam shaft, M, which is extended through one of the end walls of the casing. The chain is then passed around a driving gear 9! and back to the gear 82. The driving gear is made integral with a clutch 92 which is slidably mounted on a drive shaft 93. The shaft has a pin 94 which is normally engaged by the clutch, whereby a driving connection between the shaft and driving gear with a gear 90 which is driven by an electric motor 91'. Thus, it is seen that when the motor is operating and the clutch 92 is engaging the pin 94- on the'drive shaft, the gear 9| will rotate the gears 02 and 90 through the endless chain 99, whereby the cam shaft I4 is rotated and the spacer roller is actuated. It is pointed out that the gears 02 and 90 are the same size so that the cam shaft I4 will make one complete revolution to operate all three panels in sequence while the spacer roller is actuated only once per revolution a quarter of a turn to bring the next line of indicia on the strip 99 before the window 30.

For keeping the strip taut on the winding roller 40 when the spacer roller is operated, the shaft 41 of said roller (Figures '1 and 4) extends outwardly through one of the end walls and has a collar 99, near its outer end. A pulley 99 made integral with a slidable clutch I is mounted on the shaft 41. The shaft has a clutch member IOI secured thereon and a spring I02 which surrounds the shaft and confined between the collar 98 and the pulley 99 normally holds the clutch I00 in engagement with the clutch member I 0|, whereby rotation of the pulley will rotate the winding roller shaft. The pulley is driven through the medium of a endless spring drive I09 which passes around said pulley and over the pulley 15 which is made integral with the star wheel. Thus, it will be seen that each time the star wheel 16 and the spacer roller control is given a quarter turn, the winding roller 99 is given a quarter turn to take up the slack. The resiliency of the spring drive I03 permits slipping of the winding roller 99 or pulley relative to said spring as taking up of paper increases circumference of said take-up roller. This slipping takes place between the spring drive I03 and surfaces of the members or 99.

From the foregoing, it is obvious that the entire strip 39 may be displayed line by line, each line being displayed successively from left to right. For automatically cutting off the motor after the entire strip. or] chart 39 has been displayed, through the window, an elongated slot 39' is provided in said strip (Figure 14). This slot is provided near the end of the strip and is alined with a plurality of grooves M which are formed in the spacer roller. The grooves are preferably four in number equally spaced around the periphery of the roller.

A flat spring I06 has its forward end rounded and constantly riding on the strip above the spacer roller as said strip travels through the casing. The spring has its rear end secured to a bracket I01 which is fastened to the top of the casing. The spring carries an electrical contact I08 which, when the outer end of the spring is riding on the strip, is in engagement with a contact I09. This latter contact is carried by an arm I I0 which is mounted between the spring I06 and bracket I01. The contacts I08 and I09 are connected by lead wire I08 and I09 to the electric motor 91. It is obvious that with the flat spring riding on the strip 39, the contacts remain in engagement and the electrical circuit to the motor is closed.

When the slot 39' passes beneath the fiat spring said spring can then fall into one of the grooves 4i in the spacer roller. These grooves are positioned so that one of them will be beneath the spring only when a line of indicia on the strip is before the window. This will prevent stopping the travel of the strip during the rotation of the spacer roller. When the fiat-spring I09 drops thereby stopping the operation of the entire machine. I

when the entire strip has been displayed and the motor has been stopped, it is then necessary to rewind the strip on the supply roller 36 so that said roller can be removed and another roller carrying different indicia on its strip can be inserted. -Of course, it would be possible after the rewinding to again display the same strip.

For automatically rewinding the strip on the supply roller, one of the end flanges I3 which extend rearwardly from the front wall and which are hinged on the shaft I4, is secured to a collar III (Figure 6) which surrounds the shaft and extends outwardly through the side wall of the casing. When the front wall is swung outwardly the collar is rotated on the shaft I4. The outer end of the collar carries a depending arm III which has an outwardly extending pin H2 in its lower end. The pin engages in an arcuate slot H9 in the lower curved end of a vertical bar I I4 (Figures 6 and 15)- which has its upper end pivoted to a short arm II! fastened on the outer end of the longitudinal, horizontal shaft 45 on which the friction roller 43 is carried. A coiled of the shaft 45 is such that the friction roller 49 is engaging the strip 39, as shown in Figure 4. When the front door is swung outwardly, the depending arm III' carried by the collar III which is secured to oneof the end flanges I 3 is also swung. The swinging of the arm III' raises the vertical bar II4.through the medium of the pin H2 and slot II3, which swings the arm I I9 to rotate the shaft 45 in a counter clockwise direction. This rotation of the shaft swings the friction roller arm 44 upwardly to raise the friction roller 43 from the strip, whereby said roller will not interfere with the reverse travel of the strip during rewinding.

As has been pointed out, the electric motor has been stopped by the separation of the contacts I08 and I09 caused by the dropping of the flat spring I06 into the groove H of the spacer roller. To close this circuit to utilize the same motor for rewinding, a curved rod II1 has a loop II! at one end surrounding a set screw II 9 which holds a collar I20 on the shaft 45. The other end of the rod is secured to the underside of the flat spring I06 which carries the contact I08. Normally the parts are in the position shown in Figure 11 and the spring is riding on the strip. When the spring drops through the slot 39' in the. strip and into one of the grooves H of the spacer roller, the loop H9 at the outer end of the rod II1 willcompensate for the movement. When the front wall I2 is swung and the shaft 45 rotated, as has been explained, the pin II9 engages the edge of the loop to push the rod III forwardly, whereby the flat spring I06 is swung upwardly to engage the contact I08 with the contact I09 to close the electrical circuit to the motor. a

To properly shift the gear connections for rewinding a rearwardly extending rod I2I (Figure 16) has its forward end secured to the end flange I3 and its rear end secured to a triangular member I22 which is pivoted to a support I23 extending inwardly from the end wall of the casing. See Figures 16, 19 and 20. The opposite side of flanged shifting bar I29 (Figures 6, 7 and 12).-

The bar is loosely pivoted on a stud I21 on the end wall of the casing. As shown in Figure 7 the 'bar is inclined so that its upper, end engages the clutch I made integral with a pulley 99 which drives the winding roller. The flanges at the lower end of the bar pass. between the sliding clutch 92 made integral with the drive gear 9I on the drive shaft, and a second sliding clutch I29 mounted on the outer end of the drive shaft. This latter clutch is integral with an enlarged gear I29. The drive shaft has a collar I30 on its end and a coiled spring I3l surrounds the shaft between the collar and the gear I29. A flat spring I32 is secured on the shaft between the collar I30 and the end of the coiled spring and the ends of this spring are curved to frictionally engage the outer face of the large gear I29. It is pointed out that when the gear I29 is idle, as shown in Figure '2 the flat spring I32 will ro- 'tate because it is fastened to the drive shaft and its frictional engagement with the face of said gear will tend to rotate that gear. The large gear I29 has connection through a chain drive I33 (Figure 5) with a gear I34 which is mounted to slide on the outer end of the shaft 31 of the supply roller 36 (shown in Fig. 6). A coiled spring I35 surrounding the shaft and confined between the gear and a collar secured on said shaftprovides a frictional driving connection between the gear and shaft.

From the foregoing, it is obvious that the large gear I29 on the driving shaft has driving connection with the supply roller shaft. When this gear is idle, the frictional engagement of the revolving flat spring with the face will rotate said gear sufficiently to keep the strip 39 taut between the idler 40 and supply roller 36.

When the front wall I2 of the casing is swung outwardly, as has been explained, to raise-the friction roller 43 from the strip and close the electrical circuit to the motor 91, the triangular member I22 is swung rearwardly at the same time (Figure 16) through the rod I2I secured to the end flange of the wall I2. The rearward swinging of the member I22 pulls the bar I24 inwardly which swings the lower end of the shifting bar inwardly. This action of the bar slides the clutch 92 inwardly to disengage said clutch from the pin 94 on the drive shaft, thereby breaking the drive connection. The enlarged gear I29 immediately slides inwardly under the tension of the coiled spring I3I so that its clutch I28 engages the pin 94, whereby the gear I29 willbe driven by the drive shaft 93. At the same time that the clutches 92 and I28 are shifting due to the inward swinging of the lower end of the shifting bar I26, the outward swinging of the upper end of said bar'slides the clutch I00 out of engagement with the clutch member IOI whereby the drive to the winding roller 46 is disconnected. Thus it is seen that when the front wall I2 is swung outwardly the drive gear 9| is disconnected which stops rotation of the gears 82 and 90 which drive the spacer roller shaft 42 and cam shaft I4 respectively. At the same time, the winding roller pulley 99 is disconnected and a direct drive from the gear I 29 to the gear I34 on the shaft 31 of the supply roller is had. So long as the front wall I2 remains open, the reverse travel of the strip 39 within the casing continues.

As soon as the front wall is closed, the parts return to their normal positions.

For automatically regulating the speed of the motor, regardless of the temperature or load or current fluctuation, a governor I35 (Figure 7) is mounted on the motor shaft 91'. The governor comprises a sleeve I36 fixed on the motor shaft and a slidable member I31 also surrounding the shaft and coimected with the sleeve by pivoted arms I38 and fiagsprings I39. When the load on the motor decreases, the speed of the motor shaft increases and the centrifugal force throws the arms I39 outwardly, which causes the out-- ward travel of the slidable member I31 on the shaft.

As the member travels outwardly it strikesa fiat spring I40 which carries an electrical contact I at its upper end. This contact normally engages a contact I42 to'close a directcircult to the motor 91. When'the governor strikes the arm I40, the contacts are separated and the electrical current must then pass through a coil I43 which diminishes the current and lessens the driving power of the motor. Whenever the load increases'or the current fluctuates downwardly, the member I31 travels inwardly on the shaft and permits the contacts MI and I42 to again engage, whereby a direct current is conducted to the motor. Thus, it is obvious that an accurate, positive regulation of the speed of the motor is had at all times.

1 It is pointed out that any desired indicia may be displayed on the strips. If words or sentences are displayed, such words are shown successively line by line, a portion of a line at a time from left to right. This forces the observers eyes to follow the matter shown and he becomes trained to follow in a natural way full lines of print, and at an increased speed. The device could also be used in teaching arithmetic. By holding the last panel in-operative, two members may be successively displayed in the other two panels and the pupil asked to give the total or result. Further, the device not only teaches the pupil to read and recognize words instantly, but the exercise also brings about a more flexible condition of the eye muscles.

The description which has been given recites more or less detail of a particular embodimentwindow, an exhibitor mounted to travel withinthe casing and bearing indicia or symbols for display through thewindow, panels carried by said wall and closing saidwindow, means for operating the panels in sequence, whereby positions of each line of indicia are displayed in sequence,

operating means for the exhibitor, and means responsive to the outward swinging of the front wall for automatically stopping the travel of the exhibitor when the wall is swung.

2. In an educational device, the combination of, a casing having a front wall adapted to swing outwardly from said casing and provided with a window, an exhibitor mounted to travel within the casing and bearing indicia or symbols for display through the window, panels carried by said wall and closing said window, means for operating the panels in sequence, whereby portions of each line of indicia are displayed in sequence, operating means for the exhibitor, means responsive to the swinging of the front wall for automatically stopping the travel of the exhibitor when the wall is swung, and means also responsive to the swinging of the wall for rewinding the exhibitor when said wall is swung.

3. A displaying apparatus comprising a casing having a swinging wall provided with a window, an exhibitor mounted to travel within said casano es driving said supply roller in the reverse direction 1 to rewind said exhibitor on said supply roller.

JAMES Y. TAYLOR. CARL C. TAYLOR. 

